What you can do is usually about one and a half to two years, depending on the recovery of your own teeth. Although the best age for orthodontics is 9- 13-year-old teenagers, in theory, orthodontics can be done as long as the teeth are healthy, regardless of age, but the time for orthodontics will be slightly longer than that of minors, usually about half a year or even longer, depending on the reduction and absorption of alveolar bone of individual teeth. Another influence is that adults are indeed more likely to rebound than teenagers, so adults are required to wear retainers for a longer time and need to wear retainers more seriously, which can generally prevent rebound. I hope I can help you.